remove the variables section from the radio button and checkbox type

Author: xabbuh

reference/forms/types/checkbox.rst

@@ -13,8 +13,6 @@ if the box is unchecked, the value will be set to false.
 +-------------+------------------------------------------------------------------------+
 | Options     | - `value`_                                                             |
 +-------------+------------------------------------------------------------------------+
-| Variables   | - `checked`_                                                           |
-+-------------+------------------------------------------------------------------------+
 | Overridden  | - `empty_data`_                                                        |
 | options     | - `compound`_                                                          |
 +-------------+------------------------------------------------------------------------+

reference/forms/types/radio.rst

@@ -15,8 +15,6 @@ If you want to have a Boolean field, use :doc:`checkbox </reference/forms/types/
 +-------------+---------------------------------------------------------------------+
 | Rendered as | ``input`` ``radio`` field                                           |
 +-------------+---------------------------------------------------------------------+
-| Variables   | - `checked`_                                                        |
-+-------------+---------------------------------------------------------------------+
 | Inherited   | - `value`_                                                          |
 | options     | - `data`_                                                           |
 |             | - `empty_data`_                                                     |